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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '301145317899a76e647ad4fe3a470ae3ddca19a37020f2717f39707ca396807c' 
  AND token = 'uj8kUOtU5U9ufggTIgha/kXD92LAc1os58OQ9PTVMSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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