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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8080b0e70dd349fa197612e0fee4a94d386527dfce899d0a144b9a8764674de' 
  AND token = 'fYc0tLVN6LJHd6R8AxnbV2taHSldY+0llLwFozoGwSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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