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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '837a40a9c4a38c399a7b5ef2fff39c146aca7b8ba0ea28a42294d99c9e86dd2e' 
  AND token = 'San0XeeTKC2DHRHuZqTitp7XzMpzOsd+RXmw0zdbRes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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