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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9be368730f38dab5d83a7af5d7d331a27b9c9ade24ce430952cca8ea9984325' 
  AND token = 'ITThsAkenTH0IooL8zS8ajaQy49Redd1aYQrDh7EDh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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