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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93a50948fe02d743b9a2706723fd4454f0695d4c01297ef1488ee43d315cbb90' 
  AND token = 'tYSieEb5OeClAAV5SNDyoOJCZIubtpNOkXrsrsy3IUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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