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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10d04ae8c04cb3bc7e7bbffb6e1f9788629114d5eaa67be3acf04ddac103528c' 
  AND token = 'xEl3un+UsrSba3r/odn2ttc250j0/T/4bIt2EK9iBww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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