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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b4df46a9168b10ceb47de9f51343273612848cf65f280a7b43002a107a7701a' 
  AND token = 'QsdI8F6r5o53EWhrRAqLS24JSOIh6CTiCNaHUPU07jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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