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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '485c073d6f4c427ee483dec6c25e9465631a0620db7cb087d2fe014722d15b0c' 
  AND token = 'axFLrloEEmzWPmW6COX6fBP6gDlR8f+ZpH8IJdZxToE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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