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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f4e0973a07d85f0c9eed8798622aa77b1cea359a84b0f312d8cf23db9243f57' 
  AND token = 'wlBnJoc9dlV9mVGObb6q1GzWxsWtIh5qgwNy0sX9NTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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