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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11f7404fdc741d5b1c0b950fc1b89ea082887be46489c8989750dc45f05c89b9' 
  AND token = '/6hfEjQRI2xWBut4QTOi2XpMOPaEN0tDX/NHlskfklw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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