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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78633fa8f2ee9fb9196adc266cbb19a281f1da5188669ae3dbac7e6f6b7bee5a' 
  AND token = 'y1/tdm2dax7GyNRogduA2J/n9IwfbMXzaFT0Ee86Ouo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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