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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3192466b37e53ab0ba5684dd4bdd0254ed399dd6af3bd02583f3a27ce42daf56' 
  AND token = 'Tkaa8VnzpmRvgRlTuGSyl/d4NcxpPL6wO18H7YEXSjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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