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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76fc00a6f2d5d182c7b5874e61081bf49bbb4552b04af4067f7a15b9f7441233' 
  AND token = 'lKzX+FgdKcHeb1GuODElyV7KWkdNeMesdsRAWCZHnz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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