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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a406a44c3271bb8198c19c38feac2df6c15e723be004d68c093e6d15ef5b25ea' 
  AND token = 'Rs0956TR3aS7Q4I6ZYpK69qHLSsI3m6w9n6oZxzufx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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