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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29135545ac3b0f2a80d0b0f22d376a3f298b583e1efb8cbb469f332e4c7037b7' 
  AND token = '3q7KfskTrFh62fd4IwKZyA27boKDqUGJGf9BNwQJIv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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