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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15b5f334d79fd5e321d3567a1f808812cbd72ce331e369fedd40251b026ed32f' 
  AND token = 'fxNh2cHxzMnXZFTyBABKlff7CQiGcu7Y8bwQRMiUNy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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