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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be48ec12c0a1381afa4e14cd3b3eb8f6cfb3faa469b41f7fab9cc39b237acf69' 
  AND token = '5AijbPblbPumI1wifbIREKylCBCXxJKeB5zcXqeX1oE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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