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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79554962d2ae135433a2526c4e54f8a5bae7818329b6ecc77d30f4ba07ea3cb7' 
  AND token = '+iLDk6o6M1l/VLIXzEx8MT/WfX9zwOCGR8CVy1pL6QE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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