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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7350dbaf9f0d8fe9468ebf05efa9905569938850fb53ed9ddc780e320ef75e49' 
  AND token = 'Tc6aCOCmFoSJ3qNgX4//HCRNZ8JFVOUEDG4AOFrTddQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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