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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '630eea6ae815cab817691a964b18122041a08685108a9d99d564b44c8c956aa4' 
  AND token = 'XqAKaCGkujWWxFu8BAnKDd++c3Vz1UR3XPjymRFdDIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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