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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16b0dcd407af2d0a3b82860ca01ac607299dbf133019e8ff423a1df72bb2e719' 
  AND token = 'wZDj99D/leN7Eujd9r34PTUHNNrnsc+i5Cnnr2tpdYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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