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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0c198f500ab2444b2c930e7fdf9c4bc9fb40b209ccd41dcadf0e7dc398cfb0c' 
  AND token = 'IF4qMljoaoS8m3+fLUIoQIPIYXQ+6I80zyNCFtk5xIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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