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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a01adc04a18dfc54c9a4cb05590f8fd68ff477b75490d4bf9484085a1f2a98a9' 
  AND token = 'IfsgCEuuDomUgQkLFUdIv3LvPsOuV4FyfSG4RH+vXPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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