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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd624c9d3b887f89e128e306a8c2f471f8d9b9e177d62e5db293e2db4a7f43107' 
  AND token = 'm7SDXaQNsUcx9Z0fSBt80RaI0iRb0eqWyILxYXEV3NE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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