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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67a9c499df8baba0c17b57728e493b50973d9972139d4c48383019903b11ac45' 
  AND token = '8q6DByIcPcJaI+UKHJz6jnnbauo6zt3KdsiaWTlOh6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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