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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11f9ddd8bd80ec497a2b0fe736c1a5f60629822f457cbfb569fa800704ab862b' 
  AND token = '7LDLAkwX+pd6mH/8YJGMGjrkmPuReLnrcHDOmVpaRfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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