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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58229d3b1cc17ce7e3d8b15de7587dd6d7f824bee73d82e4102b299828e56afa' 
  AND token = 'SqAiCzSKLPT6tV67WzRdFo/D86bkv4W3xUUqDWkQ14A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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