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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab50ceacb08f937203f04c583ec32603029ced7b6b49cd12117ca1e45c5822dc' 
  AND token = 'XKZSmFLPE8/epm6djxdyx9lLo/mj30lWyu0zapJ+rcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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