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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '647035ffcf88df6bf0345697fe74b3365f926a3dfdb8b8b1e468920962d02967' 
  AND token = 'IAbchyjwFW2h/bkjXnt1VesyMDhVTptNJOUzwC9ciF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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