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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91ac80fa16621373c3a5535831198b06791a365a25acf5de337adb121c2c2261' 
  AND token = 'FOM1+dvUZJsfYSniqaP4se0SKU2+8KsCpJK5sqDnYGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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