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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1463d3489bf5306f866db0990bf3fc2f048ece91fdb8c33e3c9d1077c5adf3a' 
  AND token = 'Bgzf1fk///chi4vu9ZILxMFUqFhpAnMiDN7M2KQ1V98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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