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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6352686c294dab368fde3fb1299f0bd410f161254adf0524cd0e0848a26c4aad' 
  AND token = 'xSlgdzpfXNAlIjAIDT8TgKEuW1yPc3JesIhvS3C9GMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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