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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0abdd4da3ae6f27eb2f96e4953a4c626d55c5e0a54e9da2505d8a71857e325b6' 
  AND token = 'lqpU8oPrbGdaEKN6i2SPDcgq7LcWg3gBhA3KbzyMtzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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