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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83cf3f01ca69a51a7195a32781a9f2d5339b3b5e3ac1b65dc76bf9a185a2ac9d' 
  AND token = 'n1GvAsDLDv2DboevZgF9y2PLPz8hhBdeBKs0GuApZMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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