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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90add19c8bc8a45d19ac6469a00180923353a328b021d13b1469c9e2cbd411b6' 
  AND token = '5YGyDTYdjiXFK/l+kcNIBwTDJyajgeK2kQYZMBwdh0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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