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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '313ea972b7a9d4f3658923d9b3db5727a582c7b50e0bb7c33b1af817192ea93a' 
  AND token = 'ngF5wLf90WQambqp8TqXe0SvA2Ksub63Y0+svhmPtSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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