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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84dc7a5c57990afea8582bc81ae4dbfe92eccdd49bd33bf8fa615b9bf38000f1' 
  AND token = 'EH3Mz+5v9OqEaLkXXfyJH9caGdR+z9oR7Z+TSjyCgic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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