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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1de742e2cb1faaa37eb2d089f4ce30e8cbdd578c0d410331d4f1b7b4e06066fa' 
  AND token = 'FGpDW6Z4Pxzy6WEnQv5cyPJbCrz2GrIGQ7czYXTS3zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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