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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f9ec38605f35bdd43f9c4e8b7d00e574baf166d31cd1bd563f9d2360832a4cd' 
  AND token = 'oEF0LFEkt+WE7mc+pmAgWN2XApNPu9XT1cG0IozZf1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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