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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e5627f3fe6781e836ad0642c78ded5e4c7b3452eb364cb19eadc98a40767a51' 
  AND token = 'dsZzEW4Ap8pm0sAo7EoBJ4Z3Q6f6/0FjvcE/1RYrnHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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