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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73cbdfb4d8030cb1da5b011b97dae9ff07238c83aaf4e96867cbfa771921f309' 
  AND token = 'BB30leSf8LR4wSDHhMaRFVkvEDBPAZiVstKglyPrE+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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