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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f70d2338f6dc3d403c569a1dd72585d02cf7127b2b20aede0bf61464ab515503' 
  AND token = 'C9eHEwXZUI55PxodAcIYhHNa0IepCYs1pAGuLFT1iK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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