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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98d2f81c4167f5e2c8c355bca31f43a9a0c0adbb5180902ab44c01f9cb745654' 
  AND token = 'pDycFyfL8LQ/OhdKSGNm9SvZvXkiQJjF77Xxz8MCzEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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