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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '768ce2aafdef9be8d0490114e8d017fa706093b735d8045d5364343710873c33' 
  AND token = 'oh5rCSMX4GkpnrcgHa12jiSth5D1WOibz14bzQCglW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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