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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37860ed51b33bdb1b3db6c78794e7ff79d046118155fe7a22a28393ddbe464da' 
  AND token = 'ATINyJNpVN9izCLHszVck3qkxa/EV+eJThccIvKokiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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