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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5255156fec71f9ae60fef6a0811f01044afd1724ef2baede17b06501fdbd5a35' 
  AND token = '/0v3nHXGFLkznU2XyNBM3yfp1lnvwlH5J0vMLanuumo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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