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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a3db60f14f9d1029c7e4ab4ffc12782b71584b6ff0f7ae5e7465cfcd92b9f4a' 
  AND token = 'S0BWjy/Mnp6O4hGBDxC6WnsuD3SfpdAv22VGNEW+ZT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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