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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ab3d3cfbf9df2e12c95cc79d69c88738be045d90855243a19239814f2cd5d5a' 
  AND token = '9HKVtlTN11TvetQpVL+cf56QjThV03kvcBxPt7UDosk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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