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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '307ed94adb346a740faddb13ece768292a315b97ad898fb90a4e8b16ed0fa1bb' 
  AND token = 'Fmi5IoPfj6XUk16v/wS4zjUP5IHpKhtzIh95AOx70mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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