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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbfd4e14a263480fe1868acafaf45d14f7c89b8bf79a1811d8ea29a4995c3c0a' 
  AND token = 'aIh2Su1uc7CrBy0no7nZDBZr7SmNyisShxlMluPoeHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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