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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c77c418a097cec50675a89fb7b22d73906bf622335a95ac69c7d5bb1ade6264' 
  AND token = 'Mw2cavcb8vp/1N9nNi03BcDdNR51PFGEadzNXwnj79c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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