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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae3d58e8613de440b403424f8a5c0509bacd117c8272de8649755e38e8682c0b' 
  AND token = '2tSkURS5JgFimtbClxQici4jiZ1j2JjJol5byBLPE6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00190

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}