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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7b81aa464566e1fd5b8a94777a1f2e65abac528c923a1d23f1e2be804604ea8' 
  AND token = 'e3BGG0SS+r9y4gCXlyaz6SiESxCrxiFLBy0s44bHQ6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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