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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffa25e426609ff566369dc0e235bf94abae1a6a7c406c93d91b3ca994d4c8918' 
  AND token = 'nlpjT94xGuXHNQtxWBSQY3pOHpPK8QvO3aZQKjiXyOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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