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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b8d0f11b52bf9a600470809be2a1b6fc466f7bb6c9ee78983bd78b6fb068bae' 
  AND token = 'iwUpcpELSEjDO9YBtx6cK1yVcKvFTMTxtshYrp6dFhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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