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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db9d6c0a6fd8e7c3c5408ec3ca1dfc964f01e0448101ac3431c6f17d4b6df730' 
  AND token = 'iEsrbLx7lfmF33kB5jtHo0LtjJWY4ouaed4MxJ2J1NY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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