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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67c27eaef28461880c31ca0d99bb89903b68ce91673f48f67f2c4c77fcf772e2' 
  AND token = '7DAWS+V0BJKmPy42HCfNwnMcihyZiAv3Md/Z2lWbIU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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