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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88a010a1f4e491e7b27993fded82150a9fdbd1d24b9fc2f4721d60ad3c8d19e3' 
  AND token = 'Zj/vY7p8V50BixTJ0WUxNUiuvnni/6ZOkWBkqZ6djEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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