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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83772b36c717098d70bf8e10c7dffaf3200199d1a2fdd840a8e6b0dbce854168' 
  AND token = 'NoSubZGiJ40S61kWRpMIssFbzzugRGptylbXj0WpP1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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