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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a467b46687ee4de75a5017a5c0e48b61e2545de734c606da2482ae1e0c91cdc8' 
  AND token = 'OOqZp6E1EXBD+qTdG4bEL1KhN20PBcscicHlfT9FAt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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