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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94325330fa3afbee6109aad9ab2459e3e009cdd60c61a4b9dba335923ac9081f' 
  AND token = 'L6dhCBZQ5uduUKXm+wlpZc+o9V9VtI+utz+utf0C1fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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