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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '732e5932ffc8bbf7400bc9ddc09fa8d5da9bdb1d33e37ff616f245821c4640a7' 
  AND token = 'myBOE6NblbgGJONoyGawXpm/Ea3cFHjUFoB3ygFHT3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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