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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb46ace15097e68af009ae48fb3081257ec768200ea031fac7975c2808c17a7c' 
  AND token = 'uMFECFrjpHHM6r9y9mHi97IcPxDCpPYnbsQ8+Z5eH9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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