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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd91bde3d60623607a075b9f4523b493447ecf9752f71247b02f65cdea6bdbd26' 
  AND token = '/b2MbbB8aZ13xJUMSidDD62ku3mbZM4kYiE7qTPZNIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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