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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '737e34503f3e4b0b230bc033756aa5f1afe4f57a9178819ac779ec794d5a2642' 
  AND token = 'CKclBwd47zlNUG3YMrDAhnbhtrHq1n6A8diqjF23gLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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