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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c38481f01c3ee9f1d865e3cb94d10e41fe231ad6166e5b9d8b0b326e1813d9f0' 
  AND token = 'FRCunEfdnN4dRZiV4R9ULFui8jpBXBYnNYrxroLFT7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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