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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baf78347f07ef592b571c8f7830d514b57cdb881639081c7962643d67f9f5a8d' 
  AND token = 'iIslGR79qxXA+HsPIzfDkbAzndiJNYR8L/GP1PzYIS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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