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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97530eefe53b875333464c4b6b07a1a30661c6368dd425cbb411089e19796084' 
  AND token = 'qIG6m064xi3YEf5cBq8X/tLZY8sNWspHuC+jVSME8ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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