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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eec738ff5d7353868d9e2411c6718da4caa4b08ccbe792d1e6314a3355d75810' 
  AND token = 'OSX0k9+Pk0FnIds2jozSEcKGdclSpJFcDP+Pe83eSeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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