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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef551e14968c854124fb28de2d0e78c13bb2263707ccd346b2fb1610f95198a4' 
  AND token = '4B5kCgikuU81138DjWnR80P0jC34BPsdqgjboX/4uq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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