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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64a3d52ac20e5a4decc6927f86051dfa4425cd193624d1591a7cdaeb5239cee4' 
  AND token = '3tfyf1yfMpTWBLk9RbgxkLLhvSbt6aSoDrUs88hN0II=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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