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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da6de5f7ddf7e6e03f0fb740494183e19146cf6c101145f67c4ee43bba39c68c' 
  AND token = 'Zf8iZvioXswcfUyue5C0DqcfFw5Mnb7nF1TpgBppPVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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