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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a1f07877217176722d2593377225a6700b45d4cba093461093217bacbd59851' 
  AND token = 'n9bAui4hs1PQa+LWJIkjULyu6Rs20b4WGwLGXkksHlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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