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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a74c88a517128f8bf7cb218fad28469c81299b8b7668cb86bce7c17440e3e83d' 
  AND token = 'rc1JAkXdgMKiIA/pIPMDXMPpJfM+XmFc/B5X1dsqfk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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